Zone-by-zone intensification, all four detection eras
Zone Lab
Four detection eras in one tool — modern (1968-present), aeronautic (1944-1967), and pre-1944 (split Pre-1911 / 1911-1943). Same interpolation method throughout: per-cell average wind speed change (kt per step), inverse-distance-weighted from 2,410 individual inbound track-step transitions across 121 storm-era entries drawn from hintfl.com's authoritative storms.json, masked to each zone's own footprint using only the currently-selected points. Blue = weakening, tan/neutral = flat, red = intensifying.
Data quality is genuinely uneven across eras, not a uniform "old vs. new" split — validated against the NOAA/AMS Atlantic Hurricane Database Reanalysis Project's published phase boundaries (Landsea et al. 2004a; 2008 reanalysis) and wireless-ship-telegraphy adoption history. Pre-1911: ship reports and land stations only, reconstructed via the Fernandez-Partagas & Diaz method. 1911-1943: station data plus COADS ship network, decades before aircraft or satellite. 1944-1967: aircraft reconnaissance era, pre-radar/pre-satellite. 1968-present: radar and satellite tracking. A zone's hatching (insufficient sample) is computed live from whichever storms are currently checked — toggle an era off and watch zones that were solid re-hatch as their sample drops below 5 points, or vice versa.
-10 kt/step (weakening)
+10 kt/step (intensifying)